Worked Example 1
Find a Ten First
6 + 5 + 4
- 16 and 4 make 10: 6 + 4 = 10
- 2Then add the 5: 10 + 5 = 15
Answer: 15
Florida Grade 1 Math · Algebraic Reasoning
MA.1.AR.1.1: Adding Three Numbers
What this Grade 1 benchmark means, worked examples, common mistakes, and a free printable worksheet.
Created by a Florida mom · Published by Tropical Learning LLC
What Is Benchmark MA.1.AR.1.1?
Children add three or more numbers with sums up to 20. They learn that they can change the order or the grouping of the numbers without changing the sum.
A smart move is to look for two numbers that make 10 and add those first. Children do not need to name the properties or use parentheses.
Official benchmarkApply properties of addition to find a sum of three or more whole numbers.
How it is tested: Grade 1 students take FAST Star Math, Florida's math test for Kindergarten through Grade 2.
Worked Examples
Worked Example 2
Four Numbers
3 + 9 + 1 + 4
- 19 and 1 make 10: 9 + 1 = 10
- 2Then add 3 and 4: 10 + 3 + 4 = 17
Answer: 17
Common Mistakes to Watch For
Thinking a different order gives a different sum
Wrong:2 + 5 + 8 and 8 + 5 + 2 have different answers.
You can add in any order. Both are 15.
Leaving out one of the numbers
Wrong:7 + 3 + 6 = 10
7 + 3 = 10, then add the 6: 10 + 6 = 16.
Helpful Math Tip
Roll three dice (or draw three number cards) and ask your child to find the total, starting with any pair that makes 10 or a double.
Related Grade 1 Skills
Make Florida Math Practice More Fun
Help your child build math confidence with original interactive questions aligned with Florida's B.E.S.T. Mathematics Standards.
Start Practicing FreeIndependent Educational Platform. FastChomp is published by Tropical Learning LLC and is not affiliated with, sponsored by, or endorsed by the Florida Department of Education. FAST and Star assessment names are referenced for informational purposes only. FastChomp practice questions are original educational materials, not official Florida FAST assessment questions.